20736724747 has 2 divisors, whose sum is σ = 20736724748. Its totient is φ = 20736724746.

The previous prime is 20736724739. The next prime is 20736724751. The reversal of 20736724747 is 74742763702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20736724747 - 2³ = 20736724739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20736724747.

It is not a weakly prime, because it can be changed into another prime (20736724787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10368362373 + 10368362374.

It is an arithmetic number, because the mean of its divisors is an integer number (10368362374).

Almost surely, 2^20736724747 is an apocalyptic number.

20736724747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20736724747 is an equidigital number, since it uses as much as digits as its factorization.

20736724747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2765952, while the sum is 49.

The spelling of 20736724747 in words is "twenty billion, seven hundred thirty-six million, seven hundred twenty-four thousand, seven hundred forty-seven".